Why at the South Pole?


Very cold, and high altitude
Very low atmospheric moisture.
Atmos. *nearly* transparent to microwaves

Atmosphere extremely stable (no daily sunrise/set)

No Sun for 6 months of the year:
Can only work on instrument in summer.
Observe in winter.

Fields remain at constant elevation angle
and superb low foreground sky available at high el!

Existing infrastructure and logistics (i.e. you guys!)